A cellular phone used to execute a game is connected to a server apparatus when a need arises to transmit or receive information. The game is individually progressed by each cellular phone. A user equips a player character with a material to use a magic in a battle. A party is formed by users of multiple cellular phones and a material possessed by the user belonging to the same party is registered in the server apparatus. When the user transmits a support request to the server apparatus during a battle, the server apparatus returns the support material possessed by other users belonging to the same party. The user of the cellular phone can also use a magic corresponding to the support material in the battle.